Automatic safety gas valve



April 17, 1934. J. J. FULLER 1,954,927

AUTOMATIC SAFETY GAS VALVE Filed A ril. 22, 1933 invenfor Jbiz/z JFuZZe/7 Patented Apr. 17, 1934 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to a safety valve for gas lines, the generalobject of the invention being to provide means for preventing the escapeof gas from burners and the like after the gas pressure has been reducedand then starts to flow again.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to behereinafter fully described, illustrated in the accompanying drawing andspecifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to theaccompanying drawing wherein like characters denote like orcorresponding 5 parts throughout the several views, and in which:-

Figure 1 is a vertical sectional view through the device.

Figure 2 is an elevation. Figure 3 is a view of the member for resettingthe main valve after the same has been closed.

In this drawing, the numeral 1 indicates a casing which is formed withthe inlet nipple 2 at one end thereof and the outlet nipple 3 at the 5other end thereof. Within the casing is arranged a nipple 4 which is incommunication with the nipple 2 and an angle-shaped partition 5 is alsolocated in the casing and is in communication with the outlet nipple,the top or horizontal wall of said member 5 having an opening 6 thereinwhich is beveled to form a valve seat. This seat is adapted to beengaged by the main valve '7, the stem 8 of which passes through one ormore brackets 9 attached to an interior wall of the casing. A spring 10encircles the stem and bears against the bracket 9 and against the valve7 and tends to hold said valve on its seat. A head 11 is formed on theupper end of the stem and is adapted to be engaged by an end of a rod 12which holds the valve off its seat, as shown in Figure 1.

The other end of the rod 12 is pivoted to an arm 13 which is pivoted tothe top wall of the casing,

as shown at 14, the arm sloping downwardly and toward the outlet end ofthe casing and has a cup-shaped valve 15 attached to its lower end whichis adapted to seat on the inner end of the nipple 4 by the action ofgravity and the weight of the parts. The forward end of the 5Q rod 2 isguided in the depending bracket 16.

Thus it will be seen that when the device is placed in a gas line forsupplying gas to burners of various kinds, the flow of gas will hold thevalve 15 off its seat so that the gas can enter the '55; casing and asthe valve 7 is raised off its seat by the rod 12 engaging under the head11, the gas will flow through the casing to the burners. However, if theflow of gas should cease or the pressure of the flow become so low as tobe insufficient to hold the valve 15 off the nipple 4, said valve wouldclose and the resultant movement of the arm 13 would pull the rod 12from under the head 11 so that the spring 10 would move the valve 7 uponthe seat 6 and thus close communication between the casing and that part06 of the line leading to the burner. Then if the gas started to flowagain, it could not pass from the casing, as the valve 7 has closed theopening 6.

When it is desired to retract the parts to permit the gas to flow, thehandle 17 of a rod or shaft 18, journaled in the casing, is turned tocause the arm 19 on the shaft to engage the head 11 so that the stem 8and valve 7 will be raised and the free end of the rod 12 will passunder the head due to the fact that the valve 15 has been moved by theflow of gas into the casing. The arm 19 is provided with an arcshapednotch 20 for receiving part of the stem 8 as the arm moves upwardly toengage the head 11, and a stuffing box is provided for the shaft 18where it passes through the casing.

Thus it will be seen that I have provided simple means for preventingthe escape of gas at burners when the gas pressure has failed and theflame at a burner has become extinguished so that if the pressure shouldcommence to flow again, the gas would escape from the burner which wouldendanger occupants of the building in which the burners are located.

It is thought from the foregoing description that the advantages andnovel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction andin the combination and arrangement of the several parts, provided thatsuch changes fall within the scope of the appended claim.

What I claim is V A safety valve for a gas line comprising a casinghaving an inlet nipple at one end thereof and. an outlet nipple at theother end thereof, a nipple within the casing and in communication withthe inlet nipple, an angle-shaped partition in the casing for separatingthe outlet nipple from the interior of the casing, said partition havinga horizontal part having an opening therein, a valve for closing saidopening, a stem on said valve extending upwardly, guiding means for thestem, a spring for normally holding said valve in closed position, ahead on the stem, an arm pivoted to the top of the casing and extendingdownwardly and forwardly, a cup-shaped valve on the lower end of the armfor fitting over the nipple within the casing under the action ofgravity and moved to open position by the flow of gas into the casing, arod pivoted to the arm and having its free end adapted to engage underthe head of the stem to hold the spring pressed valve in open position,guiding and supporting means for the rod depending from the top of thecasing and engaging the rod adjacent the free end thereof, said rodmoving longitudinally to a position to release the stem when thecup-shaped valve drops to closing position and means for raising thespring pressed valve from the exterior of the casing to permit the endof the rod to engage under the head of the stem, such means including ashaft passing through a part of one wall of the casing, a handle on theouter end of the shaft and an arm on the inner part of the shaft havinga recess in its free end for receiving portion of the stem, when theshaft is rocked to move the arm upwardly against the stem, wherebyupward movement of said arm will move the stem and the valve upwardlyagainst the action of the spring.

JOHN J. FULLER.

